CN106856244A - Method and system for diagnosing the state of fuel cell pack - Google Patents
Method and system for diagnosing the state of fuel cell pack Download PDFInfo
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- CN106856244A CN106856244A CN201610455191.XA CN201610455191A CN106856244A CN 106856244 A CN106856244 A CN 106856244A CN 201610455191 A CN201610455191 A CN 201610455191A CN 106856244 A CN106856244 A CN 106856244A
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- fuel cell
- impedance
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04298—Processes for controlling fuel cells or fuel cell systems
- H01M8/04313—Processes for controlling fuel cells or fuel cell systems characterised by the detection or assessment of variables; characterised by the detection or assessment of failure or abnormal function
- H01M8/04664—Failure or abnormal function
- H01M8/04679—Failure or abnormal function of fuel cell stacks
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/392—Determining battery ageing or deterioration, e.g. state of health
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04298—Processes for controlling fuel cells or fuel cell systems
- H01M8/04313—Processes for controlling fuel cells or fuel cell systems characterised by the detection or assessment of variables; characterised by the detection or assessment of failure or abnormal function
- H01M8/04492—Humidity; Ambient humidity; Water content
- H01M8/04529—Humidity; Ambient humidity; Water content of the electrolyte
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04298—Processes for controlling fuel cells or fuel cell systems
- H01M8/04313—Processes for controlling fuel cells or fuel cell systems characterised by the detection or assessment of variables; characterised by the detection or assessment of failure or abnormal function
- H01M8/04537—Electric variables
- H01M8/04544—Voltage
- H01M8/04559—Voltage of fuel cell stacks
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04298—Processes for controlling fuel cells or fuel cell systems
- H01M8/04313—Processes for controlling fuel cells or fuel cell systems characterised by the detection or assessment of variables; characterised by the detection or assessment of failure or abnormal function
- H01M8/04537—Electric variables
- H01M8/04574—Current
- H01M8/04589—Current of fuel cell stacks
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04298—Processes for controlling fuel cells or fuel cell systems
- H01M8/04313—Processes for controlling fuel cells or fuel cell systems characterised by the detection or assessment of variables; characterised by the detection or assessment of failure or abnormal function
- H01M8/04537—Electric variables
- H01M8/04634—Other electric variables, e.g. resistance or impedance
- H01M8/04649—Other electric variables, e.g. resistance or impedance of fuel cell stacks
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04298—Processes for controlling fuel cells or fuel cell systems
- H01M8/04694—Processes for controlling fuel cells or fuel cell systems characterised by variables to be controlled
- H01M8/04746—Pressure; Flow
- H01M8/04753—Pressure; Flow of fuel cell reactants
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/10—Fuel cells with solid electrolytes
- H01M8/1004—Fuel cells with solid electrolytes characterised by membrane-electrode assemblies [MEA]
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/389—Measuring internal impedance, internal conductance or related variables
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/10—Fuel cells with solid electrolytes
- H01M2008/1095—Fuel cells with polymeric electrolytes
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
Abstract
This application discloses the method and system of the state for diagnosing fuel cell pack.It is a kind of for by the condition diagnosing of fuel cell pack be stain method include：Measurement fuel cell piles up the impedance under predetermined low frequency and predetermined high-frequency；When impedance under predetermined high-frequency is higher than the second critical point less than the impedance under the first critical point and predetermined low frequency, increase the fuel or the amount of oxidant provided to fuel cell pack；Remeasure the impedance that fuel cell is piled up under predetermined low frequency；And the impedance under the predetermined low frequency measured in the step of remeasuring determines that fuel cell pack stains when being higher than the second critical point.
Description
Technical field
This disclosure relates to it is used to detect the technology of the contamination of fuel cell, more particularly, to for by measuring fuel
Impedance of the battery pile under high-frequency and low frequency and the state that diagnoses fuel cell pack is the method and system for being subject to stain.
Background technology
Fuel cell system is the electricity generation system that the chemical energy of fuel is translates directly into electric power.Fuel cell system includes
Produce the fuel cell pack of electric power；The fuel supply unit of fuel (that is, hydrogen) is provided for fuel cell pack；For fuel cell pack is carried
For use as the air supply unit of the air (that is, oxygen) of oxidant, it is necessary to oxidant produces electrochemical reaction；And from fuel
Battery pile is discharged heat and controls the heat and water management unit of the running temperature of fuel cell pack.Fuel cell pack passes through hydrogen
Electrochemical reaction between (fuel) and oxygen (air) produces electric power while generation needs to be discharged outside fuel cell pack
Accessory substance (heat and water).
Being suitable for the fuel cell pack of fuel-cell vehicle includes the rows of many single batteries of arrangement.Each single electricity
Pond includes being arranged in the membrane electrode assembly (MEA) at center.MEA includes the dielectric film for allowing proton to pass through.As hydrogen and
The catalyst layer of negative electrode and anode that oxygen reacts with each other place is arranged on each surface of dielectric film.Gas diffusion layers
(GDL) it is arranged on the surface of catalyst layer.Flowed by therein each with the fuel and air provided to anode and negative electrode
The baffle arrangement of field (runner) is on the surface of GDL.End plate is arranged in each end of single battery so that all of element is firm
Solid combination.
In a fuel cell stack, hydrogen and oxygen are chemically reacted so as to be ionized by means of catalyst layer.Then, occur
Oxidation reaction to produce proton (hydrogen ion) and electronics at the fuel electrode of hydrogen being provided with, and occur to include hydrogen ion with
The reduction reaction of oxonium ion is to be provided with generation water at the air electrode of air.Typical electrode for fuel cell is urged
Catalyst carrier and cocatalyst (such as, Ru, Co, Cu etc.) composition that agent is made up of carbon material.Hydrogen be provided to anode (
Referred to as " oxidizing electrode ") and oxygen (air) is provided to negative electrode (also referred to as " reducing electrode ").There is provided to the hydrogen of anode and pass through
The catalyst that is arranged on the electrode layer on the corresponding surface of dielectric film and be separated into proton H+With electronics e-.In proton and
Among electronics, only proton can selectively pass through the referred to as dielectric film of PEM and can reach negative electrode, and electric
Son is moved through GDL (conductive layer) and dividing plate reaches negative electrode.
Reach the hydrogen ion of negative electrode and the electronics by dividing plate arrival negative electrode and be contained in by dielectric film and supplied by air
Answer unit to provide the oxygen into the air of negative electrode to combine, so as to produce water.At this point, hydrionic mobile generation is along outside
The electric current of wire flowing, and in addition to water, heat is also supervened as accessory substance.
For fuel cell system, fuel cell pack can cause its performance degradation due to a variety of causes.Accordingly, it would be desirable to
In it is determined that fuel cell pack performance degradation the reason for technology.The potential cause of the performance degradation of fuel cell pack includes fuel
Immersion, drying and the contamination of battery pile.
For example, the reason for the performance degradation of fuel cell pack by mistake be defined as immersion and actual cause is fuel cell
When heap is stain, the operational control for increasing the flow rate of air is performed to solve the dry immersion of deterioration fuel cell pack
Problem.That is, it is no to use suitable measure, thus fuel cell pack can not be solved the problems, such as, and be likely to result in new
Problem.It is therefore important that accurately and precisely the state of diagnosis fuel cell pack is determining the performance degradation of fuel cell pack
The reason for, so as to suitable measure can be taken to solve the problems, such as fuel cell pack when fuel cell system goes wrong.
The above is simply intended to facilitate the background technology for understanding the disclosure, and it is being this to be not intended to mean that the disclosure falls
In the range of correlation technique in field known to technical staff.
The content of the invention
Therefore, problem above of the creation disclosure to be devoted to solving to occur in the related art, and the disclosure is intended to
The method and system of the state for diagnosing fuel cell pack is proposed, the method and system pile up high frequency by measuring fuel cell
The reason for impedance under rate and low frequency is come the performance degradation for determining fuel cell pack.
In order to realize above target, according to an aspect of this disclosure, there is provided a kind of for by the state of fuel cell pack
The method for being diagnosed as staiing, the method includes：Measurement fuel cell piles up the impedance under predetermined low frequency and predetermined high-frequency；
When the impedance of impedance under predetermined high-frequency less than the first critical point and under predetermined low frequency is higher than the second critical point, increase
There is provided to the fuel or the amount of oxidant of fuel cell pack；Remeasure the impedance that fuel cell is piled up under predetermined low frequency；And
And in remeasuring measure predetermined low frequency under impedance be higher than the second critical point when determine that fuel cell pack is stain.
When the impedance that the method may further include under the predetermined high-frequency for measuring in the measurements is higher than the first critical point,
Determine that fuel cell pack is to dry (dry).
The impedance that the method may further include under the predetermined high-frequency for measuring in the measurements is less than the first critical point simultaneously
And the impedance under the predetermined low frequency for measuring in the measurements be less than the second critical point when, determine that fuel cell pack is normal.
The impedance that the method may further include under the predetermined low frequency measured in remeasuring is critical less than second
During point, determine that fuel cell pack soaks.
In order to realize the above target of the disclosure, according on the other hand, there is provided a kind of for by the state of fuel cell pack
The method for being diagnosed as staiing, the method includes：Measurement fuel cell piles up the impedance under predetermined low frequency and predetermined high-frequency；
Impedance under the predetermined high-frequency measured in the measurement of impedance is predetermined less than what is measured in the first critical point and the measurement of impedance
When impedance under low frequency is higher than the second critical point, increase the fuel or the amount of oxidant provided to fuel cell pack；Measurement combustion
Expect the output voltage of battery pile；And the output voltage measured in the measurement of output voltage is not from immediately in carrying out impedance
When the output voltage of the fuel cell pack exported before measurement increases predetermined critical voltage level, determine that fuel cell pack stains.
The impedance that the method may further include under the predetermined high-frequency measured in the measurement of impedance is faced higher than first
During boundary's point, determine that fuel cell pack is dried.
The impedance that the method may further include under the predetermined high-frequency measured in the measurement of impedance is faced less than first
When impedance under boundary's point and predetermined low frequency is less than the second critical point, determine that fuel cell pack is normal.
The method may further include the output voltage measured in the measurement of output voltage not from immediately in carrying out
When the output voltage of the fuel cell pack exported before the measurement of impedance increases predetermined critical voltage level, fuel cell pack is determined
Immersion.
In order to realize the target of the disclosure, according on the other hand, there is provided a kind of for by the condition diagnosing of fuel cell pack
It is the system stain, the system includes：Impedance measurement meter, measurement fuel cell is piled up under predetermined high-frequency and predetermined low frequency
Impedance；And controller, fuel cell piles up impedance under predetermined high-frequency and fuel cell is piled up under predetermined low frequency
Impedance, diagnose the state of fuel cell pack, impedance is measured by impedance measurement meter, wherein controller is received under predetermined high-frequency
Impedance and predetermined low frequency under impedance, impedance measured by impedance measurement meter；When the impedance under predetermined high-frequency is less than the
When one critical point and the impedance under predetermined low frequency are higher than the second critical point, controller increase and provided to fuel cell
The operational control of the fuel of heap or the amount of oxidant；Controller increase the fuel or oxidant of offer to fuel cell pack
Amount operational control after, receive fuel cell and pile up impedance under predetermined low frequency, and controller is being remeasured
Impedance under predetermined low frequency determines that fuel cell pack stains when being higher than the second critical point.
In order to realize the target of the disclosure, according on the other hand, there is provided a kind of for by the condition diagnosing of fuel cell pack
It is the system stain, the system includes：Impedance measurement meter, measurement fuel cell is piled up under predetermined high-frequency and predetermined low frequency
Impedance；And controller, the shape of fuel cell pack is diagnosed according to the impedance under the impedance under predetermined high-frequency and predetermined low frequency
State, wherein controller receive the impedance under impedance and predetermined low frequency under predetermined high-frequency, and impedance is measured by impedance measurement
Amount；Impedance under predetermined high-frequency is less than the first critical point and the impedance under predetermined low frequency is higher than the second critical point
When, controller carries out increasing the operational control provided to the fuel of fuel cell pack or the amount of oxidant；Controller is being increased
Plus provide to the operational control of the amount of the fuel or oxidant of fuel cell pack, receive the fuel electricity measured by voltmeter
The output voltage of Chi Dui；And controller measurement output voltage from the impedance under predetermined high-frequency is measured with
The output voltage of the fuel cell pack measured by voltmeter before the impedance under predetermined low frequency increases predetermined critical voltage water
Usually determine that fuel cell pack stains.
Advantages below is had for diagnosing the method and system of fuel cell pack contamination according to the disclosure.
When the operating characteristics of fuel cell pack is deteriorated, the performance degradation of fuel cell pack can be precisely and accurately determined
The reason for, especially when deterioration is attributable to the contamination of fuel cell pack, so that operator can use suitable measure
Carry out solve problem.
Furthermore, it is possible to prevent fuel cell pack from undergoing following unfavorable condition, the i.e. problem diagnosis to fuel cell pack be forbidden
The unfavorable condition caused by inappropriate measure is taken after really.For example, there is fuel cell pack experience immersion, and fuel cell
The diagnosis of the problem of heap is erroneously determined to dry situation.In this case, perform to reduce and provide to fuel cell pack
Air flow rate operational control.This can aggravate the immersion of fuel cell pack, so as to deteriorate the stabilization of fuel cell pack
Property and durability.On the contrary, exist fuel cell pack experience dry and fuel cell pack be diagnosed as immersion situation.
In this case, it is possible to increase the operational control of the flow rate provided to the air of fuel cell pack.This can aggravate
The drying of fuel cell pack, so as to persistently deteriorate the operating characteristics of fuel cell pack.
Brief description of the drawings
Fig. 1 show according to embodiment of the present disclosure for by the condition diagnosing of fuel cell pack be stain be
The block diagram of system；
Fig. 2 and Fig. 3 are showed according to embodiment of the present disclosure for being to be stained with by the condition diagnosing of fuel cell pack
The flow chart of dirty method；
Fig. 4 A and Fig. 4 B show the song of the measurement of the impedance with the fuel cell pack by contaminated catalyst layer
Line chart；And
Fig. 5 shows the curve map of the measurement of the impedance of the fuel cell pack of the humidity of fuel cell heap.
Specific embodiment
Below, will be described with reference to the drawings preferred embodiment according to the disclosure for by the state of fuel cell pack
It is diagnosed as the method and system for staiing.
Fig. 1 show an implementation method according to the disclosure for by the condition diagnosing of fuel cell pack for stain
System block diagram.
With reference to Fig. 1, diagnostic system can include：Fuel cell pack 10；Voltmeter 11, detects the output of fuel cell pack 10
Voltage；Impedance measurement meter 12, measures the impedance of fuel cell pack 10；And controller 13, receive the impedance of fuel cell pack 10
With the information of voltage and determine the state of fuel cell pack 10.
Fuel cell pack 10 can be the element that electric power is produced by the redox reaction of oxygen and hydrogen.
Fuel cell pack 10 can include multiple single batteries of stacked in series.Each single battery can include membrane electrode
Component and dividing plate.Membrane electrode assembly can be made up of dielectric film, catalyst layer and gas diffusion layers.Dividing plate can be arranged in
On the surface of corresponding gas diffusion layers and flow field can be provided with, fuel and air are provided to negative electrode and sun by flow field
Pole, and water (accessory substance of generation) can be expelled to outside fuel cell pack by flow field.
Hydrogen and oxygen are ionized by the chemical reaction of catalyst layer.Then, there is oxidation reaction to be provided with hydrogen
Electrode at produce proton (hydrogen ion) and electronics, and be related to the reduction reaction of hydrogen ion and oxonium ion so as in offer
There is generation water at the electrode of air.The catalyst carrier that is made up of carbon material for the typical electrode catalyst of fuel cell and
Cocatalyst (such as, Ru, Co, Cu etc.) is constituted.Hydrogen is provided to anode and oxygen (air) and provided to negative electrode.There is provided to anode
Hydrogen resolves into proton H by the catalyst being arranged on the electrode layer in the respective surfaces of dielectric film+With electronics e-.In proton
Among electronics, only proton can selectively pass through dielectric film (referred to as PEM) and reach negative electrode.In proton movement
While by dielectric film, electronics is moved through gas diffusion layers (conductive layer) and dividing plate reaches negative electrode.
Reach the hydrogen ion of negative electrode and the electronics by dividing plate arrival negative electrode and be contained in by dielectric film and supplied by air
Answer unit to provide the oxygen into the air of negative electrode to combine, so as to produce water.Here, hydrionic mobile generation is along outer lead
The electric current of flowing, and in addition to water, also supervene as the heat of accessory substance.
Diagnostic system according to present embodiment can be for detecting urging for the single battery of composition fuel cell pack 10
The system of the contamination of agent layer.
Impedance measurement meter 12 can be the element of the impedance for measuring fuel cell pack 10.Impedance measurement meter 12 can be with various
Mode is configured.For example, impedance measurement meter 12 can apply to single electricity voltage signal or current signal with preset frequency
All single batteries in pond, the single battery group of the single battery including predetermined quantity or fuel cell pack 10, detect fuel
The curtage at a predetermined frequency of battery pile 10, and calculate the impedance of each frequency content.
According to present embodiment, the impedance measured by impedance measurement meter 12 can include high-frequency resistance and low-frequency impedance, high
Frequency impedance is the impedance of the fuel cell pack when predetermined high-frequency voltage or current signal is applied, and low-frequency impedance is to apply
The impedance of fuel cell pack when predetermined low-frequency voltage or current signal.Electricity for measuring high-frequency resistance and low-frequency impedance
Pressing the frequency of signal can be changed with the specification of fuel cell heap.For example, high-frequency can be 1000Hz or higher and
Low frequency can be 10Hz or lower.
Impedance measurement meter 12 can be operated according to the control of controller 13.
Controller 13 can control all operationss of fuel cell system.According to present embodiment, controller 13 can make
With the information provided by voltmeter 11 and impedance measurement meter 12, the information needed for calculating the contamination for determining fuel cell pack 10, and
And the other elements that can control as needed in fuel cell system.
Controller 13 can be according to the high-frequency resistance and low-frequency impedance measured by impedance measurement meter 12, by voltmeter 11
The output voltage of the fuel cell pack 10 of measurement and its change, determine the various states of fuel cell pack.
Hereinafter, the state of diagnosis fuel cell pack of execution in the diagnostic system having been described above will be described to be stained with
Dirty method.The operation of diagnostic system will be more clearly understood from reference to diagnostic method as described below.
Fig. 2 and Fig. 3 are showed according to embodiment of the present disclosure for being to be stained with by the condition diagnosing of fuel cell pack
The flow chart of dirty method.
First, controller 13 can receive the output voltage of fuel cell pack 10 in step S11 from voltmeter 11, and can
To be determined whether that in step S12 the shape of fuel cell pack 10 must be diagnosed according to the output voltage of the fuel cell pack 10 for being received
State.Controller 13 can be further provided with electric current, and the electric current is provided by measurement from the lead-out terminal of fuel cell pack 10
Galvanometer 14 to the electric current of load is measured.That is, controller 13 can receive the output of fuel cell pack 10 in step S12
Voltage and current, and determine the output voltage corresponding with the output current of fuel cell pack 10 whether less than predetermined reference electricity
Pressure V1.
Then, in step S13, controller 13 can indicate impedance to survey when output voltage is less than preset reference voltage V1
The impedance (high-frequency resistance and low-frequency impedance) and reception of the measurement fuel cell pack 10 of gauge 12 are measured by impedance measurement meter 12
High-frequency resistance and low-frequency impedance.Then, in step S14 and step S15, controller 13 will can be surveyed by impedance measurement meter 12
The high-frequency resistance and low-frequency impedance of amount are compared with the first predetermined critical point Z1 and the second predetermined critical point Z2.Controller 13
Can the impedance of step S14 medium-high frequencies less than the first critical point Z1 and in step S15 low-frequency impedance be higher than the second critical point
During Z2, increase the fuel or the amount of oxidant provided to fuel cell pack 10, to increase the output voltage of fuel cell pack 10.For
This, controller 13 can open the drain valve (purging valve) 15 on residual hydrogen exhausting line to increase hydrogen (i.e. fuel cell
The fuel of system) amount, or the operational ton that the circulating pump 16 that residual hydrogen is back to fuel cell pack 10 can be increased.This
Outward, controller 13 can increase the operational ton of pressure fan 17 (air supply unit) to increase the sky provided to fuel cell pack 10
The amount of gas (oxidant).
In step S17, controller 13 can again indicate that impedance measurement meter 12 measures fuel after past scheduled time slot
The low-frequency impedance of battery pile, and the low-frequency impedance and second that will can be remeasured by impedance measurement meter 12 in step S18
Critical point Z2 compares.
The comparative result of step S18 show the low-frequency impedance of fuel cell pack 10 do not reduce but still above second
During critical point Z2, controller 13 can determine that the reduction of the output voltage of fuel cell pack is attributable to being stained with for fuel cell pack 10
It is dirty.
This determination of controller 13 can be based on the high-frequency resistance of fuel cell pack and the characteristic of low-frequency impedance with fuel electricity
Association (link) between the contamination of Chi Dui.
Fig. 4 A and Fig. 4 B show measuring for when the catalyst layer of fuel cell pack the is stain impedance of fuel cell pack,
And Fig. 5 shows the measurement of the impedance of the fuel cell pack of the humidity of fuel cell heap.
Specifically, Fig. 4 A and Fig. 4 B show the impedance of fuel cell pack as the CO of the catalyst layer of fuel cell pack stains
Degree change.As shown in in Fig. 4 A and Fig. 4 B, when the catalyst layer of fuel cell pack seriously stains, low-frequency impedance
Can increase.However, high-frequency resistance will not change according to the contamination degree of catalyst layer.
With reference to Fig. 5, it is found that low-frequency impedance can be dramatically increased with the aggravation of the immersion degree of fuel cell pack.
With reference to Fig. 4 A, Fig. 4 B and Fig. 5, aggravated with staiing or soaking, low-frequency impedance can increase.The contamination of fuel cell pack
Problem can not be solved by providing the measure of fuel or oxidant, but immersion problem can be provided to fuel electricity by increasing
The measure of the fuel of Chi Dui or the amount of oxidant is solved, because the fuel or oxidant that provide remove water or moisture.Therefore,
According to embodiment of the present disclosure, when the low-frequency impedance of fuel cell pack is higher than predeterminated level, controller 13 can be in step
S16 is provided the operational control of more multi fuel or oxidant to solve the problems, such as immersion.That is, controller 113 can increase
The supply of hydrogen or air.If the low-frequency impedance of fuel cell pack 10 is reduced with the result of operational control, can be in step
The state of fuel cell pack 10 can be diagnosed as immersion by rapid S18 in step S181.Even if if however, in the behaviour of controller 13
After controlling the low-frequency impedance of fuel cell pack 10 be still it is high, then can be with the state of step S19 fuel cell packs 10
It is diagnosed as staiing.
Fig. 3 is shown according to another implementation method for being the method stain by the condition diagnosing of fuel cell pack.
Implementation method of the implementation method of Fig. 3 with Fig. 2 for step S11 to S16 is substantially the same, but with lower section
Face is different, i.e., controller 13 can make after the operational control of the output voltage that step S16 carries out increase fuel cell pack 10
The state of fuel cell pack 10 is diagnosed with the testing result of the output voltage of fuel cell pack 10.
According to the implementation method of Fig. 3, after the operational control (step S16) of output voltage of fuel cell pack 10 is increased
During past scheduled time slot, the output of the fuel cell pack 10 that controller 13 will can send in step S21 and S22 from voltmeter 11
Voltage compared with predetermined critical level, and if the output voltage of fuel cell pack 10 is not increased to more than critical level,
Then can step S23 by the condition diagnosing of fuel cell pack 10 for stain.This is based on following design, if i.e. fuel cell pack
The reduction of 10 output voltage is attributable to the immersion of fuel cell pack 10, then the journey soaked by the operational control of step S16
Degree can be mitigated and the output voltage of fuel cell pack 10 can increase.Therefore, when the output voltage of fuel cell pack 10 exists
When step S18 increaseds to over predetermined critical level, controller 13 can determine the reduction of the output voltage of fuel cell pack 10
It is attributable to immersion.
In the implementation method of Fig. 2 and Fig. 3, when it is higher than the first critical point Z1 that step S14 determines high-frequency resistance, controller
13 can determine that fuel cell pack 10 is dry (step S141).It is determined that high-frequency resistance is less than the first critical point Z1 (S14)
And when determining that low-frequency impedance is less than the second critical point Z2 (S15), controller 13 can determine fuel cell pack in step S151
10 is normal.
Diagnostic method and system according to embodiment of the present disclosure can precisely and accurately determine fuel cell pack
The reason for performance degradation, and hence in so that suitable measure can be taken to carry out solve problem.
The disclosure prevents fuel cell pack to experience problems with, i.e., carried out in the state to fuel cell pack inaccurate
The problem caused by inappropriate measure is taken during diagnosis.Although for example, the worsening reason of reality is immersion, the diagnosis of mistake
It is that the performance degradation of fuel cell pack is attributable to when drying of fuel cell pack, reduce the operation control of air flow rate
System and the therefore performance of deterioration fuel cell pack.The disclosure can prevent the diagnosis of such mistake, so as to prevent fuel electricity
Stability and the durability deterioration of Chi Dui.On the contrary, the diagnosis of mistake is fuel electricity being drying although the worsening reason of reality
When the deterioration of the performance of Chi Dui is attributed to the immersion of fuel cell pack, increase the operational control of air flow rate, and
Therefore the performance of deterioration fuel cell pack is continued.The disclosure prevents the diagnosis of such mistake, so as to prevent fuel cell pack
Performance continues to deteriorate.
Although the preferred embodiment of the disclosure, those skilled in the art have been described for illustrative purposes
It should be understood that without departing substantially from it is such as disclosed in the appended claims scope of the present disclosure with spirit in the case of,
Various modifications, addition and replacement are possible.
Claims (10)
1. a kind of for being the method stain by the condition diagnosing of fuel cell pack, comprise the following steps：
Measure the impedance that the fuel cell is piled up under predetermined low frequency and predetermined high-frequency；
Impedance under the predetermined high-frequency is higher than second less than the impedance under the first critical point and the predetermined low frequency
During critical point, increase the fuel or the amount of oxidant provided to the fuel cell pack；
Remeasure the impedance that the fuel cell is piled up under the predetermined low frequency；And
When impedance under the described predetermined low frequency measured in the step of described remeasuring is higher than second critical point, really
The fixed fuel cell pack stains.
2. method according to claim 1, further comprising the steps：
When impedance under the described predetermined high-frequency measured in the measuring process is higher than first critical point, it is determined that described
Fuel cell pack is dry.
3. method according to claim 1, further comprising the steps：
Impedance under the described predetermined high-frequency measured in the measuring process is less than first critical point and described
When impedance under the described predetermined low frequency measured in measuring process is less than second critical point, the fuel cell pack is determined
It is normal.
4. method according to claim 1, further comprising the steps：
When impedance under the described predetermined low frequency measured in the step of described remeasuring is less than second critical point, really
The fixed fuel cell pack immersion.
5. a kind of for being the method stain by the condition diagnosing of fuel cell pack, comprise the following steps：
Measure the impedance that the fuel cell is piled up under predetermined low frequency and predetermined high-frequency；
Impedance under the described predetermined high-frequency measured in the step of the measurement impedance is less than the first critical point and in institute
When impedance under the described predetermined low frequency measured in the step of stating measurement impedance is higher than the second critical point, increases and provide to described
The fuel of fuel cell pack or the amount of oxidant；
Measure the output voltage of the fuel cell pack；And
The output voltage measured in the step of the measurement output voltage is not from defeated before the measurement for carrying out impedance
When the output voltage of the fuel cell pack for going out increased predetermined critical voltage level, determine that the fuel cell pack stains.
6. method according to claim 5, further comprising the steps：
When impedance under the described predetermined high-frequency measured in the step of the measurement impedance is higher than first critical point, really
The fixed fuel cell pack is dry.
7. method according to claim 5, further comprising the steps：
Impedance under the described predetermined high-frequency measured in the step of the measurement impedance less than first critical point and
When impedance under the described predetermined low frequency measured in the step of the measurement impedance is less than second critical point, institute is determined
It is normal to state fuel cell pack.
8. method according to claim 5, further comprising the steps：
The output voltage measured in the step of the measurement output voltage is not from immediately in carrying out the measurement impedance
The step of before the output voltage of the fuel cell pack that exports when increased the predetermined critical voltage level, it is determined that described
Fuel cell pack soaks.
9. a kind of for by the system that the condition diagnosing of fuel cell pack is contamination, the system to include：
Impedance measurement meter, measures the impedance that the fuel cell is piled up under predetermined high-frequency and predetermined low frequency；And
Controller, impedance under the predetermined high-frequency is piled up according to the fuel cell and the fuel cell pile up it is described pre-
Determine the impedance under low frequency, diagnose the state of the fuel cell pack, impedance is measured by the impedance measurement meter,
Wherein, the controller receives the impedance under the impedance and the predetermined low frequency under the predetermined high-frequency,
Wherein, the impedance under the predetermined high-frequency is higher than less than the impedance under the first critical point and the predetermined low frequency
During the second critical point, the controller performs the operation control for increasing the amount provided to the fuel or oxidant of the fuel cell pack
System；
Wherein, the controller increases the operation provided to the fuel of the fuel cell pack or the amount of oxidant in execution
After control, the impedance that the fuel cell that reception is remeasured is piled up under the predetermined low frequency, and
Wherein, when impedance of the controller under the described predetermined low frequency for remeasuring is higher than second critical point, really
The fixed fuel cell pack stains.
10. a kind of for by the system that the condition diagnosing of fuel cell pack is contamination, the system to include：
Impedance measurement meter, impedance under predetermined high-frequency and predetermined low frequency is piled up for measuring the fuel cell；And
Controller, for impedance of the basis under the predetermined high-frequency and the impedance under the predetermined low frequency, diagnoses institute
The state of fuel cell pack is stated,
Wherein, the controller receives the impedance under the impedance and the predetermined low frequency under the predetermined high-frequency, the resistance
It is anti-to be measured by the impedance measurement meter,
Wherein, the impedance under the predetermined high-frequency is higher than less than the impedance under the first critical point and the predetermined low frequency
During the second critical point, the controller performs the operation control for increasing the amount provided to the fuel or oxidant of the fuel cell pack
System,
Wherein, the controller increases the operation provided to the fuel of the fuel cell pack or the amount of oxidant in execution
After control, the output voltage of the fuel cell pack measured by voltmeter is received, and
Wherein, in the output voltage for measuring not from the impedance under the predetermined high-frequency is measured and the predetermined low frequency
The output voltage of the fuel cell pack measured by the voltmeter before the impedance under rate increased predetermined critical voltage
During level, the controller determines that the fuel cell pack stains.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR10-2015-0174746 | 2015-12-09 | ||
| KR1020150174746A KR101755923B1 (en) | 2015-12-09 | 2015-12-09 | Method and system for diagnosing contamination of fuel cell stack |
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| Publication Number | Publication Date |
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| CN106856244A true CN106856244A (en) | 2017-06-16 |
| CN106856244B CN106856244B (en) | 2021-03-12 |
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| CN201610455191.XA Active CN106856244B (en) | 2015-12-09 | 2016-06-21 | Method and system for diagnosing the state of a fuel cell stack |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US10020525B2 (en) |
| KR (1) | KR101755923B1 (en) |
| CN (1) | CN106856244B (en) |
| DE (1) | DE102016111437A1 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109713340A (en) * | 2017-10-26 | 2019-05-03 | 现代自动车株式会社 | Method for diagnosing the saturation state of fuel cell pack |
| CN110635156A (en) * | 2018-06-22 | 2019-12-31 | 海斯特耶鲁集团公司 | Closed loop control for fuel cell water management |
| CN111916794A (en) * | 2019-05-08 | 2020-11-10 | 现代自动车株式会社 | Fuel cell vehicle water removal system and method using impedance |
| CN112909300A (en) * | 2021-01-26 | 2021-06-04 | 新源动力股份有限公司 | Method for judging shutdown purging of fuel cell |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6944650B2 (en) * | 2018-06-05 | 2021-10-06 | トヨタ自動車株式会社 | Regeneration processing method for lithium-ion secondary batteries |
| CN113782778B (en) * | 2021-09-03 | 2023-09-29 | 北京格睿能源科技有限公司 | Electric pile water management regulation and control method and device based on fixed frequency impedance and gas pressure drop |
| WO2024069735A1 (en) * | 2022-09-27 | 2024-04-04 | 株式会社Subaru | Fuel cell deterioration determination device and fuel cell vehicle |
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2015
- 2015-12-09 KR KR1020150174746A patent/KR101755923B1/en active IP Right Grant
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2016
- 2016-05-26 US US15/165,888 patent/US10020525B2/en active Active
- 2016-06-21 CN CN201610455191.XA patent/CN106856244B/en active Active
- 2016-06-22 DE DE102016111437.5A patent/DE102016111437A1/en active Pending
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| CN101213696A (en) * | 2005-06-30 | 2008-07-02 | 丰田自动车株式会社 | Fuel cell system |
| US20100286939A1 (en) * | 2009-05-08 | 2010-11-11 | Samsung Electronics Co., Ltd. | Method and apparatus for diagnosing deterioration of fuel cell |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109713340A (en) * | 2017-10-26 | 2019-05-03 | 现代自动车株式会社 | Method for diagnosing the saturation state of fuel cell pack |
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| CN112909300A (en) * | 2021-01-26 | 2021-06-04 | 新源动力股份有限公司 | Method for judging shutdown purging of fuel cell |
| CN112909300B (en) * | 2021-01-26 | 2022-02-15 | 新源动力股份有限公司 | Method for judging shutdown purging of fuel cell |
Also Published As
| Publication number | Publication date |
|---|---|
| US10020525B2 (en) | 2018-07-10 |
| CN106856244B (en) | 2021-03-12 |
| KR20170068648A (en) | 2017-06-20 |
| US20170170500A1 (en) | 2017-06-15 |
| DE102016111437A1 (en) | 2017-06-14 |
| KR101755923B1 (en) | 2017-07-10 |
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